弹性金属塑料复合材料摩擦系数的方程拟合及其应用

Equation Fitting of Friction Coefficient of Elastic Metal-Plastic Composites and Its Application

基于弹性金属塑料复合材料,对其摩擦系数的方程拟合及其应用进行了研究。结果表明,摩擦系数随摩擦时间的延长逐步趋于稳定,此时开始进入摩擦磨损的稳定阶段。如果将石墨添加到塑料工作层当中,将会构建层状结构,并与PPS、TPI、TLCP热塑性材料发生协同效应,从而促进金属表面均匀致密的自润滑转移膜的形成。增大复合材料的载荷和转速,此时能够确保以更短的时间进入到摩擦稳定阶段,也就是说增加转速和载荷以后,可以实现形成转移膜时间的前移。磨损体积和摩擦系数随塑料工作层材料配比的不同具有显著的变化,磨损量也有所不同。随着石墨和热塑性聚酰亚胺(TPI)的增加,在载荷增加时,复合材料摩擦系数变化量比其他配比要小。采用软件MATLAB7.0,根据复合材料的摩擦系数、结合强度和塑料工作层对数据进行拟合,从而获得塑料工作层配比和摩擦系数、结合强度间的拟合函数。

Based on elastic metal-plastic composites,the equation fitting of friction coefficient and its application are studied in this paper.The results show that the friction coefficient tends to be stable with the increase of friction time,which indicates that the friction and wear have entered a relatively stable stage.Because of the addition of a small amount of graphite in the plastic working layer,graphite will form a layered structure,which will produce synergistic effect with PPS,TPI,TLCP thermoplastic materials,thus promoting the formation of uniform and compact selflubricating transfer film on the metal surface.With the increase of rotational speed and load,the time of composites entering the friction stabilization stage is shortened obviously,which indicates that the formation time of transfer film is relatively advanced with the increase of rotational speed and load.The wear volume and friction coefficient have significant changes with different material ratio of plastic working layer,and the wear amount is also different.With the increase of graphite and TPI,the change of friction coefficient of composites is smaller than that of other composites when the load increases.Using software MATLAB7.0,the data are fitted according to the friction coefficient,bonding strength and plastic working layer,and the fitting function between the ratio of plastic working layer,friction coefficient and bonding strength was obtained.